Fuel injection system for turbojet engine and method of assembling such an injection system
View Patent ↗A fuel injection system for a turbojet engine including a fixed part and a sliding lead-through, the fixed part and the sliding lead-through extending along a reference axis, the fixed part including a cavity that has a bottom and a closure cup, the sliding lead-through being provided with a sole plate contained inside the cavity. The injection system has increased resistance to wearing of the injector on which it is mounted. To achieve this it further includes a spring arranged in such a way as to apply to the sole plate a force capable of preventing the vibration-induced micro-movements of the sliding lead-through with respect to the fixed part in the absence of thermal expansion.
1. A fuel injection system for a turbojet engine, comprising:
a fixed portion and a sliding cross-member, the fixed portion and the sliding cross-member extending along a reference axis, the fixed portion comprising a cavity defined axially by a base and a closing cup, the sliding cross-member being provided with a flange contained in the cavity;
a spring disposed in the cavity so as to exert an axial force on the flange.
2. The injection system as claimed in claim 1 , wherein the spring comprises a corrugated plate.
3. The injection system as claimed in claim 2 , wherein the corrugated plate is circular.
4. The injection system as claimed in claim 1 , wherein the spring is axially constrained in the cavity.
5. The injection system as claimed in claim 1 comprising a washer disposed between the spring and the flange.
6. The injection system as claimed in claim 1 wherein the spring is configured to exert a force in the range 10 Newtons to 30 Newtons on the flange.
7. A combustion chamber comprising at least one injection system as claimed in claim 1 , the sliding cross-member further comprising a centring cone in which a fuel injector is inserted.
8. An aircraft engine comprising a combustion chamber as claimed in claim 7 .
9. A method for assembling an injection system comprising a fixed portion and a sliding cross-member, the fixed portion comprising a housing having a base, the sliding cross-member comprising a flange, the method comprising:
(a) positioning the sliding cross-member on the fixed portion such that the flange bears on the base of the housing;
(b) positioning a spring; and
(c) fixing a closing cup on the housing so as to form a cavity in which the spring is axially constrained.
10. A method as claimed in claim 9 , comprising between (a) and (b):
(a′) positioning a washer on the flange.
11. A fuel injection system for a turbojet engine, comprising:
a fixed portion and a sliding cross-member, the fixed portion and the sliding cross-member extending along a reference axis, the fixed portion comprising a cavity defined axially by a base and a closing cup, the sliding cross-member being provided with a flange contained in the cavity; and
spring means disposed in the cavity so as to exert an axial force on the flange.
12. The injection system as claimed in claim 11 , wherein the spring means comprise a corrugated plate.
13. The injection system as claimed in claim 12 , wherein the corrugated plate is circular.
14. The injection system as claimed in claim 11 , wherein the spring means are axially constrained in the cavity.
15. The injection system as claimed in claim 11 , comprising a washer disposed between the spring means and the flange.